Order jokes

An infinite number of mathematicians walk into a bar. The first one orders a beer. The second one orders half a beer. The third one orders a fourth of a beer. The bartender stops them, pours two beers, and says, "You guys should know your limits."

A time traveler walks into a bar.

He orders a beer and a shot of whiskey.

A Roman walks into a bar.

He holds up two fingers and says, "Give me five beers."